Valve



f time! LEwIs D. cAsTLE, ori GEEENSBURG, PENNSYLVANIA, AssIcNoE 4ToJOHN- PATVENT T. KELLY, OF BROOKLYN, NEW YORK, AND GEORGE M. JONES,OFPITTS- BURG, PENNsYLvANIA.

SPECIFICATION forming part of Letters` Patent No. 530,393, datedDecember 4,1894.

' l Applicationiled March 9, 1894-.. Serial No. 502,963. (No model.)

To @ZZ whom, it may concern.:

Be it known that I, LEWIS D. CASTLE, a resident of Greensburg, in thecounty of Westmoreland and State of Pennsylvania, haveinvented a new anduseful Improvement in Yalves; and I do hereby declare the followlng tobe a full, clear, and exact description thereof.

My invention relates to valves.

The object of my invention is to provide a stufling-box in which thepacking is s securely held as to prevent its turning with the stem andthe consequent turning of the cap of the stuffing box, whereby the wearand tear on the packing are diminished, while at the same time thepacking may be readily removed.

To these ends my invention comprises, generally stated, the combinationwith a valve, of a hood having at its upper end a shelf or ledge andbeyond and integral with the same Figure l is a vertical section of myim# proved valve when open. Fig. 2 is a like view when closed. Fig. 3 isa top view showing the screw cap and handle or wheel removed, and Fig. 4is a cross-section on the line 4-4 Fig. 2 looking in the direction ofthe arrow.

Like letters indicate like parts in each ligure of the drawings.

I haveillustrated my invention in connection with the ordinaryglobe-valve a which is provided with the inlet and outlet ports b b',which are threaded intcriorly to receive the pipe connections. The valvechamber c is provided with the valve seat OZ within which the valve e onthe end ofthe stem f is'adaptcd to seat itself. The valve a is providedwith the 'threaded connection g with which the hood h engages. This hoodhis threaded on the interior as at and with said threaded interior h4the threaded portion f ofthe stem l Vstem the valve e is seated orunseated as desired. `Vlithin the hood h is the annular valve seat twith which the last thread f2 of the threaded portion f' on the stem fengages. This thread f2 is adapted to tit snugly around the annular`seat 'Z and act as a` valve, when the main valve e is open and saidvalve f2 `has been drawn up against said annular seat t'. This preventsthe steam from escaping up around the valve stemf when the valve e isopen. This provides a very simple and inexpensive form of valve, as theannular seat 'Z may be formed at the same time as the threads h bysimply allowing the milling tool which forms said threads to continue towork for a short time after said threads have been formed. The lastthread f2 of the stem f without any change in form providesa valve forengaging the seat t', so that there is practically no eXtra workentailed in the construction of this valve. The hood Zt is furtherprovided With the ledge or shelf Zt and the angular bearing block Zextending therefrom. The said bearing block .Z is in the form of a nutand maybe quadrangular, hexagonal or of a greater number of faces. Thebearing block Z is dished or countersunk, as at Z'. Packing m of anysuitable material is Wound around the bearing block Z and rests upon theledge or shelf 7o. The packing also surrounds the stein f adjacent tothe bearing block Z. When the packing has been wound around the stem thecap n is screwed down over the bearing block Z. This will act to `torcethe packing m down into the `dished portion Z of said bearing block Z,also to bind the packing closely around the angular edges ot the bearingblock Z and down on the ledge Zo. By this construction I obtain a valvestem tightly packed to prevent the escape of the steam. Furthermore thepacking is bound so tightly in place that upon turning the stem thepacking remains stationary and does not turn with the stem. .This actsto prevent the Wearing away of the packing and increases its life.

If it is desired to remove the packing m the stem f is turned until thevalve f2 is seated IOO within the annular seatiof the hood h. This willprevent the escape of steam around the stem when the packing is removedand prevent injury to the person doing the Work. By removing the cap nthe packing m can be readily removed. While the dished portion Z of thebearing bloekZ receives the packing forced down therein, yet the shapeof said dlshed portion allows of the ready removal of the packingmaterial even though it may have become hard and tightly wedged therein.My improved stuffing box is not limited in its scope to any particularform of valve or valve-stem.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a valve, the combination of a hood havlng at its upper end a shelfor ledge and beyond and integral with the same a polygonal bearing blockof smaller diameter than the interior diameter of the screw threaded capprojecting therefrom, atraversing stem passing through the hood andcarrying the valve, and a packing cap engaging with said hood,

substantially as and for the purposes set forth. 1

hood, substantially as and for the purposes f set forth.

In testimony whereof I, the said LEWIS D. CASTLE, have hereunto set myhand.

LEWIS D. CASTLE. Witnesses:

OHAS. E. WHITE, W. C. LooR.

